Cutting tool



P.LUFT

Jan. 2, 1940.

CUTTING TOOL Filed Jan. 20, 1938 Patented Jan. 2, --1940 cUr'frrNG 'rootPeterLuft,,Aylshzumn` Saskatchewan, Canada, assigner of vone-fourth ltoAndrew Ostlund, Aylsharn, Saskatchewan, Canada .y Application JanuaryZO,1938, Serial No. 185,977

InCanada February 9, 1937 y y i 2 claims.

This invention relates'to'cutting tools and has more-particularreference to that type of device slats tolthe conveyor canvas'it isdifficult toremove them without tearing cr otherwise damagy ingthecanvas, as a result, upon the removaly of theeslat or slatswithordinary tools the canvas .and other elements invariably are. no longeruseful for pthe -purpose required. This obviously necessitatesreplacement of the canvas entailing considerable expense and notinfrequentlyl results in; considerable loss of time through idleness yofthe machine vavvaiting `replacement parts.

With the present invention the foregoing and i other `objections and`disadvantages'are overcome ina simple and practical manner; therefore,onev ofthe objects of the present invention contemplates a device ofthis character which will sever holding means such as rivets and likedevices 'ordinarily employed for securing purposes.4 j

Another objectv of the Apresent invention is to provide a device of this'character which will permit'the insertion of the cutting edges of thetool between the joined articles so that the cutting operation Will notdamage or destroy the articles during the severing of vthe rivets. f

A further object of the invention is to providea device of thischaracter which will effects. substantially wedge like action thatpartially separates the connected articles preliminary to the rivetsevering operation.

A still further object of the invention is to provide a device of thischaracter which in operation will permit the cutting tool tov straddlethe fastened article during progressive operation.

Yet a further object of the invention is to provide a tool of thischaracter which embodies a variable leverage which is substantiallycompounded when the cutting or severance point is reached. y f- Otherobjects and advantages of the invention will become apparent as thedescription proceeds, the invention itself consisting in the novelcombination and arrangement of parts hereinafter swingably movablehandle24.

described in detail and illustrated in the accompanying drawing inWhich; n

Fig. l is a side view of myimproved cutting tool, the dotted linesindicating an open position of theoperat'ingparts.

Fig. 2 is a planv view of Figjl With a portion of the handle meansbroken avvay,"and

FigfB is a side view of the cutting elements in position readyto severholding means such as bolts or rivets which bind or secure a slat toacanvas conveyor. Referring. now to the details in structure disclosedvinthe accompanying drawing in which like letters and numerals ofreference designate corresponding parts in the various views, the letterA `indicates the cutting assembly, the letter B the handle operatingmeans as a Whole and the letter C a portion of a canvas conveyor whichin this instanceis` employed for purposes of i1- lustration. v l' Thecutting assembly comprises vthe pair of 'substantially L"-shapedV orangle-shaped arm members I5 `and I6 which when in pivotally associatedandv closed position follow substantially the form of a triangle. Thesearms are pivotally connected at' one extremity of each asat Il and atthe base thereof terminate in the form of cutting or lsevering portionsor edges I8 and I9.

Secured to thev arm I6 in any suitable man-` be provided with anextension piece 2l which terminates in the form of a yoke 22 adapted tostraddle andbe secured to the arm members I5 and `I6 at their pivotalpoint Il. Pivotally connected to the handle 29 as indicated at 23 is aMeans for connecting the movable handle to the arm `I5 includesvconnectingi rods 25 pivotally connected to f such handle as at 26 andhaving their opposing ends connected to a stub shaft 2l rotatablymounted in a hub- 28 which in turn is carried by the arm I5`intermediate its pivot and cutting portions. As observed in Fig. 2 thestub shaft 21 is rotatable inits hub mounting thus providing asubstantially swivel connection at this point for the arml I5.

The extremities of the connecting rods connecting the shaft 2l arethreaded as indicated at 29 and provided with lock nuts 30 which enablethe arm members and consequently the cutting elements I8 and I9 to beadjusted'in relation to one another.

Additional means for regulating and adjusting the cutting eifect of thetool may be provided in the form of a set screw or the like 3| extendingthrough the arm I5 while a further set screw may be provided for the arm24 as indicated at 32. 'I'hus the set screws in combination with theaforementioned adjusting means provide for the adjustment of the cuttingelements necessitated through wear, resharpening or otherA conditions orwhere it is desirable `to partly sever an article.

In Fig. 3 of the drawing I have illustrated a cutting operation as beingeffected where a slat is to be removed from a conveyor canvas. In thisillustration the conveyor canvas is indicated by the letter C, the slatby the numeral 33 and the slat retaining or holding means is indicatedby the numeral 34. A backing such as a strip of leather is indicated at35.

During a severing operation where a slat is to be removed from aconveyor canvas or the like, the tool is opened as indicated in Fig. 1by dotted lines, suiciently to straddle the `slat 33 and the cuttingelements positioned as indicated in Fig. 3. The handle members are thenoperated to cause the cutting elements to move toward eachother and asthe elements move near the device tobe severed they travel in asubstantially horizontal plane. As the members i8 and I9 approach eachother a wedging action is elected by the element formations whichseparates the canvas from close contact with the slat so that when thecutting elements reach the rivet or other fastening means, the canvas isseparated from the slat. By continued pressure upon the handle membersthe holding means is severed without damage or injury to the canvas. i

Reverting again to the operation of the tool, it will be observed thatthe action of the arms l5 and I6 is variable due to. their novelarrangement and that of the opera-ting handle means. At the same time itwill also be observed that at certain stages the leverage action of thehandle means is substantially compounded.4 As a consequence, the earlyclosing operation of the cutting elements is relatively rapid inmovement, then as the closing progresses,irapid movement decreases andleverage increases. Thus when the pivotal connection 26 moves from whatmay be termed a vertical alignment with respect to the pivotal point 23to a point approaching horizontal alignment of these points, theleverage is compounded. l From the foregoing it will be seen that I havedevised a novel, practical and useful tool which may be applied to avariety of uses and includes therein adjusting means for the tool aswell as variable and compounding action. i

What I claim as my invention is:

1. A cutting tool comprising, a pair of sub stantially L-shaped armmembers pivotally connected together at the outer ends of their longerarms with the shorter arms swingable together. whereby said arm memberstake a substantially y triangular form, said shorter arms at their endsbeing provided with opposed cutting edges, al xed handle extendinglaterally outwardly from one of said L-shaped arm members intermediatethe pivot and the cutting portions lthereof and i lying in a planesubstantially parallel with the plane in which the jawsv move to closein cutting relation, a second arm mounted at one end on said fixed armadjacent to the associated kL- shaped arm and swingable to one extremeposid tionto lie adjacent to and substantially parallel with the fixedarm and to another position to open out angularly therefrom, a pair of.connecting rod draw links pivotally and swingably connected with saidswingable arm and extending on opposite sides of the pair of pivotallymounted L-shaped arm members, a stub shaft carried by the secondL-shaped jaw member intermediate the pivot and the cutting portionsthereof and u provided with openings receiving the ends of they pivotand the cutting portions thereof and lying` in a plane substantiallyparallel with the plane in which the jaws move to close in cuttingr'e'-lation, a second arm pivotally mounted 4at one end on said xed armadjacent to the associated L-shaped arm and swingable to` one extremeposition tclie adjacent to and substantially par'- allel with the fixedarmv and'to another position to open out angularly therefrom, a pair ofconnecting rod draw links pivotally and swingably connected with saidswingable arm and extending on opposite sides .of the pair of Lpivotallymounted L-shaped arm members, a stub shaft carriedby the second L-shapedjaw memberv in` termediate the pivot and the cutting portions thereofand provided with openings receiving. the.

ends of the connecting rods, adjustable means on said connecting rodscooperating Withsaid r stub shaft to vary the effective length of saidconnecting rods, and screw means adjustableto limit vthe closing of thecutting jaws of the L-shapedarm members.

PETER LUFT.I

